2137657021361 has 4 divisors (see below), whose sum is σ = 2139750711924. Its totient is φ = 2135563330800.

The previous prime is 2137657021351. The next prime is 2137657021369. The reversal of 2137657021361 is 1631207567312.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 408392571136 + 1729264450225 = 639056^2 + 1315015^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2137657021361 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2137657021369) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1046843750 + ... + 1046845791.

It is an arithmetic number, because the mean of its divisors is an integer number (534937677981).

Almost surely, 2^{2137657021361} is an apocalyptic number.

It is an amenable number.

2137657021361 is a deficient number, since it is larger than the sum of its proper divisors (2093690563).

2137657021361 is a wasteful number, since it uses less digits than its factorization.

2137657021361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2093690562.

The product of its (nonzero) digits is 317520, while the sum is 44.

The spelling of 2137657021361 in words is "two trillion, one hundred thirty-seven billion, six hundred fifty-seven million, twenty-one thousand, three hundred sixty-one".